# US 5,344,633 A · Alkali metal silicate composition with potassium compound additive

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- Number: US 5,344,633 A
- Document ID: US5344633A
- Status: Granted
- Kind: A
- Application number: 08/075,926
- Filed: 1993-06-14
- Granted: 1994-09-06
- Earliest claimed: 1990-11-14
- Assignees: Eka Nobel AB
- Inventors: Olle Sorensson; Krister Severinsson
- Web page: https://patentgrep.com/patent/US5344633A

## CPC

- C01B 33/325: {After-treatment, e.g. purification or stabilisation of solutions, granulation; Dissolution; Obtaining solid silicate, e.g. from a solution by spray-drying, flashing off water or adding a coagulant}
- C11D 3/08: Silicates
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

The invention concerns a solid alkalimetal silicate having a molar ratio SiO.sub.2 :M.sub.2 O from about 1.5 to about 3, in which M is an alkalimetal substantially consisting of sodium and potassium. The silicate contains from about 1 and up to about 5% by weight of K.sub.2 O based on the dry material and the water content being from about 16 to about 25% by weight based on the total weight. Further, the invention concerns a method of its preparation, its use and a cleaning agent composition containing the silicate above.

## Claims

### Claim 1

Solid alkali metal silicate having a molar ratio SiO.sub.2 :M.sub.2 O from about 1.5 to about 3, in which M is an alkali metal comprising sodium and potassium, the silicate containing from about 1 and up to about 5% by weight of K.sub.2 O based on the dry material and the water content being from about 16 to about 25% by weight based on the total weight.

### Claim 2 (depends on 1)

Alkali metal silicate as claimed in claim 1, wherein it has a bulk density exceeding about 800 g/l.

### Claim 3 (depends on 1)

A method of preparing a silicate according to claim 1, the method comprising the steps:
(a) drying an aqueous solution of an alkali metal silicate to a solid state having a water content from about 16 to about 25% by weight, the alkali metal silicate having a molar ratio SiO.sub.2 :M.sub.2 O from about 1.5 to about 3 in which M is an alkali metal comprising sodium and potassium;
(b) adding one or more potassium compounds to the solution prior to the drying or to the dry material in an amount so that the product will contain from about 1 to about 5% by weight of K.sub.2 O based on the dry material.

### Claim 4 (depends on 3)

A method as claimed in claim 3, wherein potassium carbonate, potassium hydroxide or potassium silicate is added prior to the drying.

### Claim 5 (depends on 3)

A method as claimed in claim 3, wherein the drying is performed in a spray dryer.

### Claim 6 (depends on 2)

A method of preparing a silicate according claim 2, the method comprising the steps:
(a) drying an aqueous solution of an alkali metal silicate to a solid state having a water content from about 16 to about 25% by weight, the alkali metal silicate having a molar ratio SiO.sub.2 :M.sub.2 O from about 1.5 to about 3 in which M is an alkali metal comprising sodium and potassium;
(b) adding one or more potassium compounds to the solution prior to the drying or to the dry material in an amount so that the product will contain from about 1 to about 5% by weight of K.sub.2 O based on the dry material.

### Claim 7 (depends on 4)

A method as claimed in claim 4, wherein the drying is performed in a spray dryer.